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Mana burn is a feat that enables the caster to generate extra
spell slots at the expense of her physical health. A Wizard will
be able to select any spells she has memorized and then to select
any number of slots desired.

For every spell slot over her normal limit, she must sacrifice
1d4 hitpoints per level of spell. The caster can convert hit-dice
into spell levels for the purpose of powering extra spells. Thus,
if a wizard wished to prepare 3 more Flaming Sphere spells than
she is able to memorize, she may tap into her health to create additional
slots, suffering 2d4 points of damage to generate a second level
spell slot each time she casts a Flaming Sphere above her limit.
If she wished to prepare an extra Ice Storm spell, she would suffer
4d4 damage every time she cast this spell above her limit. A wizard
must determine exactly which spells to prepare in this method, and
how many extra slots she wishes to allow herself beforehand; All
potential uses of this ability must be declared by the player of
a wizard during spell preparation. A sorceror could use this feat
with any spells in his repetoire. Any hit points lost at the start
of the day may not be recovered by healing in any form. It is as
if the caster has permanent less hitpoints for that day.

This adds to the suspense of a close battle by permitting a mage
to be a powerful force for a longer time, but the random loss of
hitpoints adds an element of risk and uncertainty; heightening the
excitement.

This feat also is suggestive of a higher level feat; Improved
Mana Burn, which would change this damage to subdual damage. Improved
Mana Burn will have the extra prerequisite of two other meta-magic
feats aside from original Mana Burn and the ability to cast 5th
level arcane spells.